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t L L A H s R A M P J m d O M 0 W BOILER FOR PAPER PULP.

Patented Feb. '24, 1885.

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lhvirnn Stati ns n'rnrrr rrrca JAMES F. MARSHALL, OF RUMFOR-D, RHODEISLAND.

BOILER FOR PAPER PULP.

SPECIFICATION forming part of Letters Patent No. 312,875, dated February24:, 1885.

Application filed September 1, 1894. (No model.)

To aZZ whom it may concern.-

Be it known that l, JAMES F. MARSHALL, of Rumford, in the county ofProvidence and State of Rhode Island, have invented a new and usefulImprovement in Boilers for Paper Pulp, of which the following is afull,clear, and exact description.

My invention relates to boilers in which wood and other materials areboiled with acids and other agents for separating the libers of thewood. Such boilers require to be lined with lead or other material ableto resist the action of the acids,in order to protect the iron from theaction of the acid, and as usually made the sections are transverse andunited by horizontal flanges, so that there are about v five joints toeach boiler.

The objector my invention is to reduce the jointed surfaces andconsequently lessen the liability of leakage, and to that end I form thelJUi-Ul' with vertical flanges, and further pack the joints, all ashereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 isa side elevation, partly sectional, of a boiler of theimproved construction. Fig.

" 2 is a cross section of the same; and Fig. 3 is a detail section inlarger size of the flangejoint.

The two sections of the boiler A are con nectcd together by means oftheir flanges a. which extend lengthwise of the boiler. The upper partof the boiler is drawn inward to form a steam-dome, b, and the bottom isalso drawn inward to give support to the lining and also reduce the areaof the false bottom, specified hereinafter.

c is the lead lining of the boiler, attached and held in place by itsedges, that are bent out to pass between the flanges (1.. The turnededges of the lead are corrugated, and in the joint between the surfacesis a packing, d, of asbestos, lead, or other suitable material, so thatwhen the flanges are drawn together by the bolts the jointis renderedperfectly tight. The lining c terminates a short distance from thebottom of the boiler, so as to leave aclear space below. The objectot'this is that in case the lining leaks the steam and acid escapingthrough the leaks will condense when the boiler cools down and work downbehind the lining to the space below and escape by small holes bored inthe bottom of the boiler. "Vitlr out this opportunity to escape thewater of condensation would be converted. to steam when the boiler isreheated, and the pressure would bulge the lining.

e is a perforated false bottom supported by brackets f. The object ofthis is to prevent the steam from acting directly on the wood or othermaterial.

By uniting the boiler-sections by longitudinal flanges the extent ofjoint-surface is large ly reduced, and there is consequently lessliability otleakage, which is liable to weaken, it not break, thelining. The boiler is also less expensive to manufacture and line.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The boiler A, provided with lining c, and formed ot'two sectionsunited by flanges a lengthwise of the boiler, as shown and described.

2. The packing (I, combined with boilerflanges a, and lining 0, havingcorrugated edges, as specified.

3. The boiler having its lower end drawn inward and with a space formedbetween its bottom and lining, as and for the purpose specified.

JAMES F. MARSHALL. Vitnesses:

WILLARD I. NEWMAN, ARTHUR D. LITTLE.

